Heat rash (prickly heat) is a red or pink rash usually found on body areas covered by clothing. It can develop when the sweat ducts become blocked and swell and often leads to discomfort and itching. Heat rash is most common in babies, but may affect adults in hot, humid climates.
Heat rash can usually be identified by its appearance and does not usually require medical attention. However, if doesn't go away after 3 or 4 days, or if it appears to be getting worse, or if your child develops a fever, contact your health professional right away. Read more about the causes and symptoms of heat rash.